#include <iostream>
using namespace std;
namespace wd{
int number=10;
void display(){
cout<<"wd::display()"<<endl;
}
}
namespace wh{
void display(){
    cout<<"wd2::display()"<<endl;
}
}


void test(){
using wd::display;
using wh::display;
wd::display();
wh::display();
}
int main(int argc, char * argv[]){
    test();

    return 0;
}

